Better documentation is badly needed
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Summary
Please answer the following questions in sentences.
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What is the feature? Please provide us with better documentation based on the examples you've given, namely nested lists.
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Why is having this feature important to you? There are many features of Sortable that I don't understand how to use. I am unable to use nested lists because I don't understand how they work and how the indexing is taken care of.
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Who else will find having this feature helpful? Essentially, anyone wanting to use Sortable. I've been using Sortable in a very simple example, but I can't take it much further to use nested lists, for instance, because I just don't understand how the more advanced features work.
Additional Context
I'm using Sortable in a Firefox extension called Context Search.
Better documentation of event handler environment. Specifically what is the value of this in event handlers?